There's this esoteric programming language: http://www.dangermouse.net/esoteric/piet.html http://www.dangermouse.net/esoteric/piet.html where the source code a

There's this esoteric programming language: http://www.dangermouse.net/esoteric/piet.html http://www.dangermouse.net/esoteric/piet.html where the source code are images similar to works of Piet Mondrian. And there's ColorForth where the colors replace some of the punctuation normally used in Forth: http://www.colorforth.com/cf.htm http://www.colorforth.com/cf.htm -- this (seems?) more serious.